Improvement in gauge for filing sawh



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Letters Patent N 98,447, dated Deoember 28, 1869.

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The Schedule referred to in these Letters Patent and making part of chezsame. I

and I do hereby declare that the following is a full' land exactdescription of the same, reference being had to the accompanyingdrawings, and to the letters v of reference marked thereon.

This invention relates to an improved gauge for use in filing saws; and

It consists mainly in the employment of rollers, at#

.tached to asnitable frame, by means of which the operation of the fileis limited to a certain point.

It further consists also in various details of construction, by means ofwhich the rollers and other Vparts are adjusted to suit diiereut saws.

The details of construction, and method of opera.- tion will be fullydescribed hereinafter. i In the drawings- Figure lis a perspective viewof my invention, and

Figure 2 is a side elevation. y

lo enable othersskilled in the art to make and use my invention, l willnow proceed to describe fully itsv construction and operation.

A represents a casting, which consists essentially of the extension aand bent arms a), united by the bar ai.

By `the arrangement of parts shown, a frame is formed in which the sawis held during the operation of filing.

B B representrollers turning in slotted bearings b b, upon each side ofthe' frame A, as shown. These bearings are secured to the frame by meansof thumbscrews, which pass through the slots and enter suitable orilicesin the frame A.

To permit greater adjustment than would be'possible by means of theshits in the bearings alone, I make other orifices in the frame atproper points, into' which the thumb-screws may be shifted when desired.

C represents a bearing-bar, located upon the inside of the bar a2, whichis sustainedin place by means of pins c', extending through the bar a2,and which is actuated in a parallel plane by means of the screw c, asshown.

`D represents a latch, provided with the projection d, which is pivotedto the inside of one of the arms 3l, as shown.

The extension a is provided with a bolt and thumbscrew, by means ofwhich it is secured to the slotted standard eof base E.

`'Theoperation of my invention will be easily under-A stood.

The base E is secured to the saw-frame or table .in

any suitable manner. The saw is enclosed by the.-

frame, and the latter is adjusted on the standard at the required angleto suitthe shape of the teeth. The bearing-bar O is then advanced by thescrew c, until the saw is firmly clamped. The latch falls down over theteeth as soon as the saw is moved to the proper position for filing. Therollers should now be so adjusted that their upper edges shall be inline with the deepest point or line to be filed. It necessarily follows,therefore, that when this point is reached, the

file will operate no longer, but will bear upon the rollers.

By this device all the teeth of a saw may be uniformly tiled, it being,in fact,impossible to make a mis- A take.- It is simple in all itsparts, and yet is adapted .frame A, rollers B, bearingbar 0,*and latchD, when combined as and for the purpose described.

'.lhis specification signed and witnessed, this 5th day of August, 1869.y

OLIVER T YSON.

Witnesses: I y

- H. BEECHER,

'THOMAS O. GONNELL.

